jsut to add to the other posts if you get a spinal headace there is a 20 min fix

its called a blood patch they put an iv in and remove as much blood as they need to fill up the epidural space because as mentioned above a spinal headaceh is unequal pressure/cs fluid adn filling the space makes the headace go away liek magic

i had a lumbar puncture adn didnt get the joy of staying at the hosiptal long enough to have a clot form so i endedup with a slow fluid leak and wne tin for a blood patch 4 days later
that said i also have small kids that needed looking after with no help so i know htat contibuted

lol so for surgery you should be fine as you will have no choice but to stay in bed

the spianl headache is a lumbar puncture side effect mostly
best fo luck with your outcome
MK